Optical imaging lens assembly, image capturing device and mobile terminal
An optical imaging lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element. The first lens element has negative refractive power. The second lens element has positive refractive power. The third lens element has refractive power. The fourth lens element with refractive power has an object-side surface being concave in a paraxial region thereof. The fifth lens element with refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof. The sixth lens element with refractive power has an image-side surface being concave in a paraxial region thereof. The optical imaging lens assembly has a total of six lens elements with refractive power.
1. An optical imaging lens assembly comprising, in order from an object side to an image side:
a first lens element having negative refractive power;
a second lens element having positive refractive power;
a third lens element;
a fourth lens element having an object-side surface being concave in a paraxial region thereof;
a fifth lens element having an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof, wherein both of the object-side surface and the image-side surface of the fifth lens element are aspheric; and
a sixth lens element having an image-side surface being concave in a paraxial region thereof, wherein both of an object-side surface and the image-side surface of the sixth lens element are aspheric, and the image-side surface of the sixth lens element has at least one inflection point;
wherein the optical imaging lens assembly has a total of six lens elements, a curvature of an object-side surface of the second lens element is greater than a curvature of an image-side surface of the second lens element, a focal length of the first lens element is f1 a focal length of the second lens element is f2, a focal length of the optical imaging lens assembly is f, a focal length of the fifth lens element is f5, and the following conditions are satisfied:
0<( f 1+ f 2)/( f 1− f 2)<1.0; and
f/f 5<0.55.
2. The optical imaging lens assembly of claim 1 , wherein the object-side surface of the sixth lens element is convex in a paraxial region thereof.
3. The optical imaging lens assembly of claim 2 , wherein an axial distance between an object-side surface of the first lens element and an image plane is TL, a focal length of the sixth lens element is f6, and the following condition is satisfied:
−0.9< TL/f 6<0 9.
4. The optical imaging lens assembly of claim 1 , wherein the fourth lens element has negative refractive power.
5. The optical imaging lens assembly of claim 4 , wherein an Abbe number of the third lens element is V3, an Abbe number of the fourth lens element is V4, and the following condition is satisfied:
0.20< V 4/ V 3<0.60.
6. The optical imaging lens assembly of claim 1 , wherein the third lens element has positive refractive power, and the first lens element has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof.
7. The optical imaging lens assembly of claim 1 , further comprising:
a stop, wherein an axial distance between the stop and an object-side surface of the first lens element is TS, an axial distance between the stop and the image-side surface of the sixth lens element is SD, and the following condition is satisfied:
0<| TS/SD|< 0.25.
8. The optical imaging lens assembly of claim 1 , wherein a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, and the following condition is satisfied:
| f 3/ f 4|<1.8.
9. An optical imaging lens assembly comprising, in order from an object side to an image side:
a first lens element with negative refractive power having an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof;
a second lens element having positive refractive power;
a third lens element;
a fourth lens element;
a fifth lens element having an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof, wherein both of the object-side surface and the image-side surface of the fifth lens element are aspheric; and
a sixth lens element having an image-side surface being concave in a paraxial region thereof, wherein both of an object-side surface and the image-side surface of the sixth lens element are aspheric, and the image-side surface of the sixth lens element has at least one inflection point;
wherein the optical imaging lens assembly has a total of six lens elements, a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the optical imaging lens assembly is f, a focal length of the fifth lens element is f5, and the following conditions are satisfied:
0<( f 1+ f 2)/( f 1− f 2)<1.0; and
f/f 5<0.55.
10. The optical imaging lens assembly of claim 9 , wherein the third lens element has positive refractive power and has an image-side surface being convex in a paraxial region thereof.
11. The optical imaging lens assembly of claim 9 , wherein the second lens element has an object-side surface being convex in a paraxial region thereof.
12. The optical imaging lens assembly of claim 9 , wherein the refractive power of the second lens element is weaker than the refractive power of the third lens element.
13. The optical imaging lens assembly of claim 9 , wherein the focal length of the optical imaging lens assembly is f, a curvature radius of the object-side surface of the fifth lens element is R9, and the following condition is satisfied:
−1<Log( R 9/ f )<10.
14. The optical imaging lens assembly of claim 9 , wherein the focal length of the optical imaging lens assembly is f, the focal length of the fifth lens element is f5, and the following condition is satisfied:
−1.5< f/f 5<0.30.
15. The optical imaging lens assembly of claim 9 , wherein a vertical distance between a non-axial critical point on the object-side surface of the fifth lens element and an optical axis is Yc51, a vertical distance between a non-axial critical point on the image-side surface of the fifth lens element and the optical axis is Yc52, and the following condition is satisfied:
0.1< Yc 51/ Yc 52<1.2.
16. The optical imaging lens assembly of claim 9 , wherein an axial distance between the object-side surface of the first lens element and an image plane is TL, a maximum image height of the optical imaging lens assembly is ImgH, and the following condition is satisfied:
TL/ImgH< 2.0.
17. An optical imaging lens assembly comprising, in order from an object side to an image side:
a first lens element having negative refractive power;
a second lens element having positive refractive power;
a third lens element having positive refractive power;
to a fourth lens element;
a fifth lens element having an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof, wherein both of the object-side surface and the image-side surface of the fifth lens element are aspheric, and at least one of the object-side surface and the image-side surface of the fifth lens element has at least one inflection point; and
a sixth lens element having an image-side surface being concave in a paraxial region thereof, wherein both of an object-side surface and the image-side surface of the sixth lens element are aspheric, and the image-side surface of the sixth lens element has at least one inflection point;
wherein the optical imaging lens assembly has a total of six lens elements, a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the optical imaging lens assembly is f, a focal length of the fifth lens element is f5, and the following conditions are satisfied:
0<( f 1+ f 2)/( f 1− f 2)<1.0; and
f/f 5<0.55.
18. The optical imaging lens assembly of claim 17 , wherein the object-side surface of the sixth lens element is convex in a paraxial region thereof.
19. The optical imaging lens assembly of claim 17 , wherein the fourth lens element has an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof.
20. The optical imaging lens assembly of claim 17 , wherein each of the refractive power of the first lens element, the fifth lens element and the sixth lens element is weaker than each of the refractive power of the second lens element, the third lens element and the fourth lens element.
21. The optical imaging lens assembly of claim 17 , wherein an Abbe number of the third lens element is V3, an Abbe number of the fourth lens element is V4, and the following condition is satisfied:
0.20< V 4/ V 3<0.60.
22. The optical imaging lens assembly of claim 17 , wherein a vertical distance between a non-axial critical point on the image-side surface of the sixth lens element and an optical axis is Yc62, the focal length of the optical imaging lens assembly is f, and the following condition is satisfied:
0.2< Yc 62/ f< 0.8.
23. The optical imaging lens assembly of claim 17 , wherein of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element of the optical imaging lens assembly, there is a space in a paraxial region between every pair of lens elements that are adjacent to each other.
24. An image capturing device, comprising:
the optical imaging lens assembly of claim 17 ; and
an image sensor, wherein the image sensor is located on the image side of the optical imaging lens assembly.
25. A mobile terminal, comprising:
the image capturing device of claim 24 .